Australia Model Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace 4.2h: 4.2 Prevent asphyxiation hazards

Reduce asphyxiation risk by avoiding work in oxygen-depleted atmospheres (under 19 percent), with air monitoring where needed; keeping work areas well ventilated, especially low-lying areas and roof spaces where gases accumulate, with windows opened and ventilation and extraction running; purging contaminants from the atmosphere or space; using air-supplied respirators particularly in confined spaces; and checking cylinders, fittings, hoses and connections for damage, corrosion or degradation, including leak detection with a small amount of detergent or leak-detection spray to look for bubbles.